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Seasonal time constraints reduce genetic variation in life-history traits along a latitudinal gradient
Polish Acad Sci, Inst Nat Conservat, Dept Ecosyst Conservat, PL-31120 Krakow, Poland..
Polish Acad Sci, Inst Nat Conservat, Dept Ecosyst Conservat, PL-31120 Krakow, Poland..
Jagiellonian Univ, Inst Environm Sci, Populat Ecol Grp, PL-30387 Krakow, Poland..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Animal ecology.
2016 (English)In: Journal of Animal Ecology, ISSN 0021-8790, E-ISSN 1365-2656, Vol. 85, no 1, p. 187-198Article in journal (Refereed) Published
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Abstract [en]

1. Time constraints cause strong selection on life-history traits, because populations need to complete their life cycles within a shorter time. We therefore expect lower genetic variation in these traits in high-than in low-latitude populations, since the former are more time-constrained. 2. The aim was to estimate life-history traits and their genetic variation in an obligately univoltine damselfly along a latitudinal gradient of 2730 km. 3. Populations were grown in the laboratory at temperatures and photoperiods simulating those at their place of origin. In a complementary experiment, individuals from the same families were grown in constant temperature and photoperiod that mimicked average conditions across the latitude. 4. Development time and size was faster and smaller, respectively, and growth rate was higher at northern latitudes. Additive genetic variance was very low for life-history traits, and estimates for egg development time and larval growth rate showed significant decreases towards northern latitudes. The expression of genetic effects in life-history traits differed considerably when individuals were grown in constant rather than simulated and naturally variable conditions. 5. Our results support strong selection by time constraints. They also highlight the importance of growing organisms in their native environment for correct estimates of genetic variance at their place of origin. Our results also suggest that the evolutionary potential of life-history traits is very low at northern compared to southern latitudes, but that changes in climate could alter this pattern.

Place, publisher, year, edition, pages
2016. Vol. 85, no 1, p. 187-198
Keyword [en]
additive variance, climate change, development time, growth rate, heritability, maternal effect, phenotypic plasticity, photoperiod, temperature
National Category
Zoology Ecology
Identifiers
URN: urn:nbn:se:uu:diva-276868DOI: 10.1111/1365-2656.12442ISI: 000368141400019PubMedID: 26333659OAI: oai:DiVA.org:uu-276868DiVA, id: diva2:903716
Funder
Swedish Research Council
Available from: 2016-02-16 Created: 2016-02-16 Last updated: 2017-11-30Bibliographically approved

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